Reversing gear



y 1938- o. SOLTERBECK ET AL 2,122,541

REVERSING GEAR Filed Sept. 8, 1936 Patented July 5, 1938 I UNITED STATESPATENT OFFICE BEVEBSING Otto Solterbeck, Neuendorf, near Eimshom, andJulius Kreisinger, Hamburg, Germany Application September 8, 1936,Serial No. 99,868

- In Gcrgnany August 17, 1938 This invention relates to a reversing gearwhich 2 and 8, 3 and I, 4 and t are connected respecis intendedparticularly for "driving ships. Apart tively to sliding blocks h, In.is, it in straight guide from the known toothed wheel gears, gears havetracks or, Us. in rigidly connected with case it. been proposed in whichtwo coaxial crank shafts A pair of sliding blocks may be provided with a5 are provided both of which are carried by a caspair of guide tracks,as shown for the pin ii in ing which can be either stopped by a brakeband Fig. 1, or a single block at the centre of the pin or coupled withthe two crank shafts. It has almay be arranged with a single guidetrack, as ready been proposed to guide in such gears the shown for thepin is. Rocking arms hi, ha, ha, hr free ends of the driving rodsconnected to the are connected, respectively to the pins i1, is, i3, i4

cranks by connecting them either to sliding pieces of the sliding blocks11, f2, 1:, 14. The rocker levers 10 which carry out a reciprocatingmovement in the hi, ha, ha, h are fulcrumed at the points k1, k2, casingor to rocking arms which are oscillatable Its, in of compensating leversl1, l2, l3, l4 respectiveabout a stationary point in the casing. Thesely which are fulcrumed, respectively, at m1, m2. constructions are opento the objection that, even ms, mi in the case a. The rocking arms )2.and the if the cranks or cams are arranged with respect compensatinglevers l are preferably U-shaped, 15

to each other at an angle of 180, shocks still as seen for the arm la inFig. l. occur,.the cause of which is that the driving rods The operationof the gear is as follows:- arranged for the movement and powertransmis- The driving shaft d is supposed to rotate clocksion andespecially the guiding thereof, do not wise, and the case a is supposedto have been ar-' give kinematically perfect lines of movement. restedby the brake band 2. The'driven shaft e is 20 On this account it washitherto not possible to rotated anti-clockwise, as will presentlyappear. use these gears in practice. oppositely directed forces act onthe rods which In order to attain this perfect guiding of the areconnected to the same sliding-block pin i. free ends of the rods, thesefree ends are, accord- Thus,- rod 5 is under tension, and rod l is undering to the invention, guided in radial direction compression, and atilting moment is exerted on 25 with respect to the driving and drivenshafts in the pin 11, whose leverage is considerable, as the rectilinearguide tracks provided especially for rods iand l for obvious reasonsmust be pitched this purpose and they are also linked to one end farapart. Similarly, rod 1 is under tension and of rocking arms which arepivotally mounted inrod 3 is under compression, and these rods aredirectly on the case at their other end. The rastill farther apart. Ithas been attempted to pre- 30 dial-rectilinear movement of the drivingrod convent the edging of the sliding blocks I under the necting pointson the rocker levers is brought action of such tilting moments byproviding addiinto kinematic agreement with the arcuate curve tionalguide tracks for the sliding blocks but this of movement of the rockerlever, owing to this was found to be practically impossible, as therocker lever being not suspended directly on the sliding blocks stillhad the tendency to edge. Ex- 35 gear case but in a short leveroscillatable about 'perience has shown that with guide tracks only a pinprovided on the inner surface of the case a satisfactory operation ofthe gear is impossible. wall. This is what has been termed mounted Thisedging is eliminated by the rocking levers indirectly. hr-Ju pivotallyconnected with the pins i1--i4 40 An embodiment of the invention isillustrated of the sliding blocks 11-44. The arms constitute 40diagrammatically by way of example in the acforks each of which ispivotally mounted on one companying drawing, in which: of thecompensating levers l1l4 at k1lc4. By Fig. 1 is an elevation of thegear, partly in axial these means, the pins ir-h are supported by thesection. fork arms of the rocking arms h1-h4, as shown Fig. 2 is asection on the line A--B in Fig. l. in Fig. 1 for the pins i1 and 1:. 45

a is the gear case, provided with. bearings c If the pivot points k1--k4where the rocking for the driving shaft d and the driven shaft e. armshr-hs are connected to the compensating d is connected to the drivingcrank shaft of an levers 1 -4 were provided, i. e. if the rocking engine(not shown) and has a pair of crank pins arms were rigidly fulcrumed inthe case a, they arranged set at 180, 2 the driven crank shaft on wouldinterfere with the straight-line movement 50 the propeller side having apair of crank pins of the sliding blocks 1', as their ends would movelikewise set at 180. Connecting rods 5, 8, I, I on arcs of circles abouttheir fixed fulcrum points. are "hingedly connected to the driving shaftd This diiiiculty is overcome by the indirect mountand connecting rodsi, 2, l, I are hingedly coning of the rocking arms h on the compensatingII nected to the driven shaft 2. The rods i and I, levers I.

We claim:-

A reversing gear, especially for ships drives, comprising in combinationa case, two crank shafts coaxial in said case, crank pins on saidshafts, connecting rods each connected at one end with the crank pins ofsaid crank shafts, sliding blocks one connected to the other end of eachof said connecting rods, radial rectilinear guide tracks in said caseeach adapted to guide one of said sliding blocks. and rocking armsindirectly

